High-dimensional Encoding in the Round-Robin Differential-Phase-Shift
Protocol
- URL: http://arxiv.org/abs/2302.07888v2
- Date: Tue, 12 Dec 2023 14:26:19 GMT
- Title: High-dimensional Encoding in the Round-Robin Differential-Phase-Shift
Protocol
- Authors: Mikka Stasiuk, Felix Hufnagel, Xiaoqin Gao, Aaron Z. Goldberg,
Fr\'ed\'eric Bouchard, Ebrahim Karimi, Khabat Heshami
- Abstract summary: We propose an approach to extend the RRDPS QKD protocol to an arbitrarily large encoding alphabet.
Our approach offers insight into bridging the gap between seemingly incompatible quantum communication schemes.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: In quantum key distribution (QKD), protocols are tailored to adopt desirable
experimental attributes, including high key rates, operation in high noise
levels, and practical security considerations. The round-robin differential
phase shift protocol (RRDPS), falling in the family of differential phase shift
protocols, was introduced to remove restrictions on the security analysis, such
as the requirement to monitor signal disturbances, improving its practicality
in implementations. While the RRDPS protocol requires the encoding of single
photons in high-dimensional quantum states, at most, only one bit of secret key
is distributed per sifted photon. However, another family of protocols, namely
high-dimensional (HD) QKD, enlarges the encoding alphabet, allowing single
photons to carry more than one bit of secret key each. The high-dimensional
BB84 protocol exemplifies the potential benefits of such an encoding scheme,
such as larger key rates and higher noise tolerance. Here, we devise an
approach to extend the RRDPS QKD to an arbitrarily large encoding alphabet and
explore the security consequences. We demonstrate our new framework with a
proof-of-concept experiment and show that it can adapt to various experimental
conditions by optimizing the protocol parameters. Our approach offers insight
into bridging the gap between seemingly incompatible quantum communication
schemes by leveraging the unique approaches to information encoding of both HD
and DPS QKD.
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